Originally Posted by sfl232
My two cents worth is:
The Orion .12 WASP motor I bought new starts hard, hates temps over 190, no factory support, no top end, no bottom end, hard to tune, hard to keep in tune.
Generally not satisfied with this motor. Looking at the TZ.
Wow! Sounds pretty bad. I’m sorry to hear that you are having problems. Have you tried disassembling and reassembling the engine and carburetor? How did you break it in? What type of fuel and glow plug are you using?
You might want to consider creating a new thread, so that some other Wasp owners can offer up some suggestions as to what the problem might be.
OS 12TZ is a good choice. Take a look at the mod versions as well.